Terry, I think the iron on patches would work. You know, the kind for patching blue jean knees. Unzip the cover and remove the foam and it should be fine.
Or, you could try to find some cloth that matches closely and stitch it in place. If you know how to sew, that is. Either way would beat buying a new mattress cover.
2011 Dodge Ram 1500 HEMI Quad Cab
2011 Jay Flight 26BH